Dell D610 in bios & windows XP battery

Hi,

This is probably caused by a wirinmg/circuit failure inside the pc, that makes it possible to monitor the power like you describe, but unable to access the power needed for the whole system to boot, or more simple: you're battery can also be broke.

the best and safest solution is to have a pc tecnician check it out...

Hope this is useful, and greetings,
Olivier.